Absolute redshifts in the CIV 1548 A line in the transition region of the quiet sun

Details Absolute redshifts in the CIV 1548 A line in the transition region of the quiet sun Absolute redshifts in the CIV 1548 A line in the transition region of the quiet sun

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..141...51h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 141, no. 1, p. 51-63.

Physics

9

Carbon, Doppler Effect, Ion Charge, Red Shift, Solar Limb, Emission Spectra, Line Spectra, Pixels, Ultraviolet Spectra

Scientific paper

Observations with the Ultraviolet Spectrometer and Polarimeter instrument on the SMM spacecraft were made at the polar limb and disk center for the accurate determination of Doppler shifts of the CIV 1548 A emission line formed at 10 exp -5 K in the transition region of the quiet sun. Individual data points representing 3 arcsec square pixels yield both redshifts and blueshifts, but the mean values from four different days of observations are toward the red. The mean redshifts are in the range 4-8 km/s and are produced by nearly vertically directed flows; the uncertainty associated with the mean values corresponds to +/- 0.5 km/s. The redshift increases with brightness of the CIV line.

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